Originally posted by: cae

I see a new behaviour on machines, which were upgraded to 5.3 TL 05. Here is my current knowledge - unfortunately, testing takes a long time... :-)

Setup: I connect from an originating AIX machine to a target machine. Sometimes the connection gets closed after 12 hours and 12 minutes (and this 12:12 time is repeatable), so it is not possible to leave a window open over night and continue working the next day.

Here is my table so far:

Originating AIX level: 5300-04-03
Connect via telnet: no timeout
Connect via ssh: no timeout

Originating AIX level: 5300-05-01 or -02
Connect via telnet: connection closed after 12:12 hours
Connect via ssh: no timeout

Can anybody explain what happened with the TL 05 upgrade and how to change this behaviour?

Thanks,
Cornelius
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Originally posted by: bassemir

Here is a link that lists the contents of 5300-05. I did not see any clear indication that one of the changes might cause your problem. But I am not an expert in this area.

http://www14.software.ibm.com/webapp/set2/abl/fixinfo?release=53&b=5300-05

It is interesting it happens after 12 hours. Will it happen every time? You mention it happens "sometimes".

We use a security gateway into our labs that will shutdown a connection if it is idle for over 12 hours. When you telnet into your 5300-05 system are you on the same subnet?

I know it would be a pain but what would happen if you started using the telnet connection after 11 hours and 59 minutes? Would you session close while you are using it?

Rich

Rich
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Originally posted by: cae

Well, it happens all the times in the setup when using telnet from 5300-05. And I believe it's after 12 h 12 m idle time, not login time, although I still have to test this.

The word "sometimes" comes from some days ago when I wasn't sure about some circumstances (like using ssh does not show this problem). So right now I would characterize it as "always and repeatable".

No gateways or firewalls are involved. Although we use an internal firewall, my particular machines for this setup are on the same subnet. And our firewall has a 16 h timeout duration anyways. It was my first thought also, of course...

Complaints started after I upgraded one server to 5300-05-01. It would be interesting to know if others can see the same. It's a simple test: opening a telnet session from a 5300-05 machine and waiting for half a day...

Cornelius
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Originally posted by: cae

Now I checked exactly:

The 12:12 hours refer to idle time. I opened two telnet sessions. The first I left alone immediately after logging in, and sure enough it was gone next morning.

The second I used for some "date" commands. Now I could watch: Exactly 12 hours 12 minutes 0 seconds after the last activity I saw "Connection closed." appearing on the screen.

Nobody else who sees this also?

Regards,
Cornelius

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Originally posted by: andycor

Ok,

I've recently updated a machine to 5300-05-02.
Yesterday I left one telnet session opened all night long and was still open after 15 hours idle. I think that the problem is related to your internal network.

Regards,
Andres Cordoba.
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Originally posted by: bassemir

Ditto that. I am running 5300-05 and have a session up for 20 hours now. Is there anything in the crontab that might disconnect your session? Does it happen from any system that telnets to the AIX 5.3 box?

Rich
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Originally posted by: cae

No, there are no new crontab entries, and it happens if I telnet from the 5300-05-02 box to somewhere else.

I don't see how and why it may be a local network problem, when telnet-ing from a 5300-04 box works fine, but from a 5300-05 box disconnects eventually. All done in the same subnet.

Perhaps some local settings which only exhibit on TL5???

I am mighty puzzled. Perhaps avoiding telnet and using ssh (good idea anyway...) provides a usable workaround for me.

Cornelius
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Originally posted by: cae

Some news:

Yesterday I did an upgrade from 5300-05-02 to 5300-05-03.

Now that made a difference! The new machine (SP3) behaved without any timeout, whereas the comparison machine (still at 5300-05-02 level) had my usual connection resets after 12+ hours on all telnet sessions.

I wonder if there was a PE in TL5?

Regards,
Cornelius (happy again)
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Originally posted by: cae

see previous post.
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Originally posted by: SystemAdmin

We are also experimenting disconnection after 12 hours for some java client-server applications and sybase replication agent...

We've been looking everywhere for an answer. I just checked and we are at 5300-05-00. I will upgrade the servers and post a follow up.
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Originally posted by: SystemAdmin

We are having the same issue with sockets disconnecting after 12 hours of operation , even when they are active.

This started after upgrading to 5300-04 and occurs on several systems.
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Originally posted by: eichher

You all hit APAR IY89429 which should be solved with 5300-05-03. We're running actually 5300-05-04 on our 570s without problems!
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